The correlation coefficient r between the number of hours a child plays video games, x, and the number of minutes spent doing homework each day, y, is - 0.74. What percent of the variation in the number of minutes doing homework cannot be explained by differences in the children's ages?

45.24%

Step-by-step explanation:

Given that:

Correlation Coefficient (r) between number of hours a child play video games and number of minutes spent doing homework = - 0.74

The Coefficient of determination (r²) gives the percentage of variation in the dependent variable which can be explained by the independent variable.

Hence, the r² value = (-0.74)² = 0.5476 ; 54.76% which is about 55% variation in the number of minutes spent doing homework can be explained by the number of hours a child plays video games.

Hence the unexplained variance due to differences in children's ages is (100% - 54.76%) = 45.24%

i am thinking c. sorry if im wrong .

step-by-step explanation:

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation: